Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0f37405cd7da6b…

MALICIOUS

PDF

36.3 KB Created: 2020-03-10 10:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df4f040a52ecd1e822d6f89f8a9ee689 SHA-1: 65e1453150d7cefff55d54f5c3f2ff7a254972d0 SHA-256: 8c0f37405cd7da6bf163f45fd3c8bae35cb66b74ac04d92bf1c0de4f73daa942
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains. The document body, though partially corrupted, contains references to 'Edgar allan poe short stories the raven' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate a link farm designed to distribute further content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://74-123-77-227.mgwnet.com/uploads/1/3/0/6/130621786/130621786.html#edgar+allan+poe+short+stories+the+raven
    • http://charlottejackman.com/uploads/1/3/0/7/130775171/3129175.pdf
    • http://susandumond.org/uploads/1/3/0/4/130435893/3395129.pdf
    • http://squareboxcompany.com/uploads/1/3/0/7/130776523/10491e3ebe83bd.pdf
    • http://nelslehtinen.com/uploads/1/3/0/8/130815093/6087364.pdf
    • http://www.webfactura.co/uploads/1/3/0/3/130323762/vades.pdf
    • http://churchilllawyers.com.au/uploads/1/3/0/6/130639616/zilexima_tiniginibi_wudukov_taxuparisax.pdf
    • http://fierceimagination.com/uploads/1/3/0/6/130620998/jixifakun-mowuger.pdf
    • http://stream.churchesofchrist.com/uploads/1/3/0/4/130476873/mulekigekexot.pdf
    • http://maidens-shield.com/uploads/1/3/0/8/130814782/621736.pdf
    • http://destindream.com/uploads/1/3/0/7/130776828/6087925.pdf
    • http://myrra.pl/uploads/1/3/0/6/130604423/tujosowezuwaxuxenuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006513.bin
2d2978c4bb21309d28a19d5dcc8132fc86da42862f45865f272e5f229810f987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 7524 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.